TWI772876B - Slotted waterproof flux-cored welding wire and method of making the same - Google Patents

Abstract

A seam waterproof flux-cored welding wire includes a welding skin and a flux core. The welding skin is rolled from a sheet to form a tube, and includes an inner tube space located at the inner side and extending axially, and an outer tube seam located at the outer side and extending axially. The flux core is filled in the inner tube space of the welding skin, and the flux core includes several granular powder particles which are mixed with flux powder and waterproofing agent. The manufacturing method of the seam waterproof flux-cored welding wire includes a welding skin rolling step and a flux core filling step. Due to the design of the drug core containing water repellent, it can indeed have good moisture and corrosion resistance, and is suitable for port machinery, offshore platforms, ships, bridges, offshore wind power marine machinery, etc.

Description

Slit waterproof flux-cored welding wire and method of making the same

The present invention relates to a flux-cored welding wire, in particular to a seamed waterproof flux-cored welding wire, and a manufacturing method of the seamed waterproof flux-cored welding wire.

Flux-cored welding wire is divided into slotted flux-cored welding wire and seamless flux-cored welding wire. The manufacturing method of the slotted flux-cored welding wire is to roll the steel strip into a tube shape from sheet to section, and roll it in the middle rolling process. Add welding flux, and the manufacturing method of the seamless flux-cored welding wire is to fill the welding flux in the steel pipe first, and then carry out the drawing process.

As far as seam flux-cored welding wire is concerned, since a seam is formed on the surface, if the moisture-proof measures are not appropriate during storage or construction, the internal flux is easily absorbed by moisture and the surface is also prone to rust, which will lead to subsequent welding. Welds are prone to porosity, which leads to other welding defects such as cold cracking, which in turn leads to poor welding quality. When the flux-cored welding wire with seam needs to be additionally electroplated, there is also a problem that the electroplating solution is immersed into the flux through the seam. Therefore, the seamed flux-cored welding wire has poor water resistance and is not suitable for environments susceptible to erosion, such as port machinery, offshore platforms, bridges, ships, offshore wind power and marine machinery, etc. The design still needs to be improved.

Accordingly, it is an object of the present invention to provide a seamed waterproof flux-cored welding wire that overcomes at least one of the disadvantages of the prior art.

Therefore, the seam waterproof flux-cored welding wire of the present invention comprises a welding skin and a flux core. The welding skin is rolled from a sheet to form a tube, and includes an inner tube space located at the inner side and extending axially, and an outer tube seam located at the outer side and extending axially. The flux core is filled in the inner tube space of the welding skin, and the flux core includes several granular powder particles which are mixed with flux powder and waterproofing agent.

The effect of the present invention lies in that the design that the flux core contains a waterproofing agent can indeed prevent the flux core from being degraded by moisture, so that the application range of the seamed waterproof flux-cored welding wire can be expanded.

Accordingly, it is an object of the present invention to provide a method of manufacturing a seamed waterproof flux-cored wire that overcomes at least one of the disadvantages of the prior art.

Therefore, the manufacturing method of the seamed waterproof flux-cored welding wire of the present invention includes a welding skin rolling step: preparing a metal sheet, first rolling the axially extending metal sheet from the sheet shape into a U shape, and then rolling along the It is gradually rolled in the axial direction so that the two edges of the two sides are butted into a tube shape, and formed into a welding skin with an inner tube space formed on the inner side and an outer tube seam formed on the outer side; and a flux core filling step: prepare a flux The material of the core, the material of the flux core is mixed with the flux powder into granules by a waterproofing agent, and in the welding skin rolling step, The material of the flux core is simultaneously fed into the U-shaped metal sheet, so as to be filled in the inner space of the tube which is subsequently rolled to form the welding skin, thereby forming a flux core.

The effect of the present invention is that the drug core can have a waterproof effect through the design that the drug core contains a waterproofing agent.

1: Welding skin

10: Metal sheet

11: Inner tube space

12: Outer pipe seam

2: drug core

21: Pills

3: seal

4: Plating

Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, wherein: FIG. 1 is a cross-sectional view illustrating an embodiment of the seam waterproof flux-cored welding wire of the present invention; FIG. 2 is a three-dimensional view Schematic diagram, briefly illustrating a manufacturing equipment for manufacturing the water-proof flux-cored welding wire of the present invention; and FIG. 3 is a forming flow chart, illustrating an embodiment of the manufacturing method of the water-repellent flux-cored welding wire of the present invention.

Referring to FIG. 1 , an embodiment of the slotted waterproof flux-cored welding wire of the present invention is elongated and includes a welding skin 1 , a flux core 2 , and a sealing object 3 . The welding skin 1 is formed into a tubular shape by sheet rolling, and includes an inner tube space 11 located at the inner side and extending axially, and an outer tube seam 12 located at the outer side and extending axially. The flux core 2 is filled in the inner tube space 11 of the welding skin 1 . The seal 3 is formed on the solder skin 1 Inside the seam 12 outside the pipe.

The material of the welding skin 1 is metal, in this embodiment, it is a low carbon steel strip, and the content of carbon, phosphorus and sulfur in the total weight of the steel strip is: C≦0.02%, P≦0.010%, S≦0.008% , but the material of the welding skin 1 is not limited to this.

The flux core 2 has a filling ratio of 10% to 20%, and includes several granules 21 which are mixed with flux powder and waterproofing agent and are in granular form. The flux powder is wrapped into a group, and the weight ratio of the flux powder and the waterproofing agent in the two components of the flux core is 8:1 to 13:1, and the preferred weight ratio is 10:1.

The percentage contents of each component in the flux powder relative to the total weight of the welding wire are: TiO ₂ : 4.5-6.5 wt %, Al ₂ O ₃ : 0.001-0.6 wt %, SiO ₂ : 0.001-1 wt %, ZrO ₂ : 0.001~0.5wt%, MgO: 0.001~0.4wt%, F: 0.001~0.5wt%, C: 0.001~0.15wt%, Si: 0.2~1.5wt%, Mn: 1.0~3.5wt%, Ni: 0.5 ~3.5wt%, Mo: 0.1~1.0wt%, Ti: 0.001~0.4wt%, and B: 0.001~0.009wt%.

The material of the waterproofing agent is selected from polymer materials with a maximum water absorption rate of less than 0.2%, such as low density polyethylene (LDPE), high density polyethylene (HDPE), etc.

The sealing material 3 has excellent water resistance, and the material of the sealing material 3 is selected from silicon compounds, chromium compounds, or a combination of silicon compounds and chromium compounds, such as water glass, potassium silicate, sodium silicate, or Organic chromium, of course, the material of the seal 3 can also be It can be selected from high molecular polymers, such as polyvinyl alcohol (PVA), polyvinyl butyral (PVB) or rubber...etc.

The flux core 2 of the slotted flux-cored welding wire uses the waterproofing agent to wrap the flux powder, which can surely prevent the flux core 2 from being degraded by moisture. In addition, in this embodiment, the seal 3 is also formed on the outer joint 12 of the pipe, so that it is firmly fixed to the outer joint 12, which can prevent the intrusion of water vapor, and can be further improved during storage or construction. It has good sealing performance and the surface is not easy to corrode, so its welding performance is good, and it can have good moisture and corrosion resistance.

In addition, the seamed waterproof flux-cored welding wire can also include a plating layer 4, which is made of copper or nickel, and is plated and sealed on the periphery of the welding skin 1 and the sealing object 3, which can make the surface smoother , and can improve conductivity.

Referring to Figures 2 and 3, an embodiment of a method for manufacturing a slotted waterproof flux-cored welding wire of the present invention includes the following steps: A welding skin rolling step: prepare a metal sheet 10, firstly roll the axially extending metal sheet 10 from a flat sheet to a U-shaped sheet, and then gradually roll along the axial direction to make both sides thereof The edges are butted into a tubular shape, and the weld skin 1 is formed with the inner tube space 11 formed on the inner side and the outer pipe seam 12 formed on the outer side.

A flux core filling step: prepare the material of the flux core 2, wherein, the material of the flux core 2 is mixed with the flux powder into granules by a waterproofing agent. The flux core filling step is to simultaneously feed the material of the flux core 2 into the U-shaped metal sheet 10 during the welding skin rolling step, so as to fill the tube which is subsequently rolled into the welding skin 1 In the inner space 11 and Shaped into the drug core 2 .

A sealing material caulking step: the material of the sealing material 3 is prepared, and after the welding skin rolling step, the material of the sealing material 3 is simultaneously formed on the outer pipe seam 12 of the welding skin 1 to form the sealing material. The seal 3 is shaped for sealing the outer pipe seam 12 .

It is worth mentioning that the aforementioned sealing material caulking step can be synchronized with the process moving speed of the welding skin rolling step, so that the welding skin rolling step does not need to be paused or slowed down, which can not only increase the production speed, but also reduce the production speed. cost.

Of course, the manufacturing method of the seamed waterproof flux-cored welding wire may also include a plating coating step: copper plating is performed on the periphery of the welding skin 1 and the sealing object 3 to form the plating layer 4, which can increase the welding time. conductivity.

To sum up, the seam waterproof flux-cored welding wire of the present invention, the flux core 2 uses the waterproofing agent to wrap the flux powder, so the flux core 2 can be prevented from being degraded by moisture during storage or construction, and its welding operation It has good performance and can indeed have good moisture and corrosion resistance. It is suitable for port machinery, offshore platforms, ships, bridges, offshore wind power and marine machinery... The purpose of the present invention can be achieved.

In the manufacturing method of the present invention for manufacturing the seam waterproof flux-cored welding wire, the material of the flux-core 2 mixed with the waterproofing agent and the flux powder is filled in the flux-core filling step, so that the waterproofing effect can be improved. , its superiority is very obvious, but it is practical.

However, the above descriptions are merely examples of the present invention, and should not be This limits the scope of implementation of the present invention, and all simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the contents of the patent specification are still within the scope of the patent of the present invention.

1: Welding skin

11: Inner tube space

12: Outer pipe seam

2: drug core

21: Pills

3: seal

4: Plating

Claims (7)

A seam waterproof flux-cored welding wire, comprising: a welding skin, which is rolled into a tubular shape from a sheet, and includes an inner tube space located on the inner side and extending axially, and an outer tube located on the outer side and extending axially. a seam; a flux core filled in the inner space of the welding skin, the flux core comprising a plurality of granules mixed with flux powder and waterproofing agent; and a sealing material formed in the In the outer-pipe seam of the welding skin, the material of the sealing material is selected from silicon compounds, chromium compounds, a combination of silicon compounds and chromium compounds, or high molecular polymers. The seamed waterproof flux-cored welding wire according to claim 1, wherein the weight ratio of the flux powder to the waterproofing agent in the flux-cored component is 8:1 to 13:1. The slotted waterproof flux-cored welding wire according to claim 1 or 2, wherein the material of the waterproofing agent is selected from polymer materials with a maximum water absorption rate of 0.2% or less. The seamed waterproof flux-cored welding wire according to claim 1, wherein the material of the sealing material is water glass, potassium silicate, sodium silicate, or organic chromium. The seamed waterproof flux-cored welding wire according to claim 1, wherein the seamed waterproof flux-cored welding wire further comprises a coating layer coated and sealed on the periphery of the welding skin and the seal. A method for manufacturing a seam waterproof flux-cored welding wire, comprising: a welding skin rolling step: preparing a metal sheet, first rolling the axially extending metal sheet from the sheet shape into a U shape, and then rolling along the axis It is gradually rolled so that both sides of the edge are butted into a tubular shape, and formed into an inner side with a A tube inner space and a welding skin with an outer tube seam formed on the outside; a flux core filling step: prepare a flux core material, the flux core material is mixed with a water repellent flux powder into granules, in the In the welding skin rolling step, the material of the flux core is simultaneously fed into the U-shaped metal sheet, so as to fill in the inner space of the tube that is subsequently rolled to form the welding skin, and form a flux core; and A sealing material caulking step: prepare a sealing material, after the welding skin rolling step, the sealing material is simultaneously formed on the outer pipe seam of the welding skin to form a sealing material. A seal is formed that seals the outer seam of the tube. The manufacturing method of the seamed waterproof flux-cored welding wire according to claim 6, wherein the manufacturing method further comprises a plating coating step, which is to form a plating layer on the periphery of the welding skin and the sealing object.

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